add skip/2 as the counterpart to limit/2 #3181
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`[[]] | implode` crash was fixed in 1.7 by jqlang/jq#2646 `[limit(0; 1, 2, 3)]` yielding 1,2 instead of nothing fixed in 1.7 by jqlang/jq#2316 `limit/2` will throw error on negative limit once jqlang/jq#3181 is merged
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This PR implements
skip/2as the counterpart oflimit/2. I also changed the behavior oflimit/2with negative count to emit an error, likenth/2does. Also, I redefinednth/2usingskip/2to minimize the impact of growth of builtin filters.